Answer
A. 12
B. 4
C. 12
D. 7
Work Step by Step
A. $CaCl_4$ has 4 carbon atoms. Three of these molecules make 12 carbon atoms
B. $CaCl_2$ has 2 carbon atoms. Two of these make 4 carbon atoms.
C. $PCl_3$ has 3 carbon atoms. Four of these has 12 carbon atoms.
D. $NaCl$ has 1 carbon atom. Seven of these make 7 carbons.
